package com.changgou.web.gateway.filter;

import com.changgou.web.gateway.service.AuthService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.net.URI;

@Component
public class AuthFilter implements GlobalFilter, Ordered {

    private static final String LOGIN_URL="http://localhost:8001/api/oauth/toLogin";

    @Autowired
    private AuthService authService;


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //1 判断当前的请求是否为登录请求 是则直接放行
        String path = request.getURI().getPath();
        if ("/api/oauth/login".equals(path)||!UrlFilter.hasAuthorize(path)) {
            return chain.filter(exchange);
        }

        // 2 从cookie中获取jti值，如果不存在，拒绝本次访问
        String jti = authService.getJtiFromCookie(request);
        if (StringUtils.isEmpty(jti)) {
            //拒绝访问
//            response.setStatusCode(HttpStatus.UNAUTHORIZED);
//            return response.setComplete();
           //跳转登录页面
            return  this.toLoginPage(LOGIN_URL+"?FROM="+request.getURI().getPath(),exchange);

        }
        //3 从redis中货物jwt的值，如果该值不存在，拒绝本次访问
        String jwt = authService.getJwtFromRedis(jti);
        if (StringUtils.isEmpty(jwt)) {
            //拒绝访问
//            response.setStatusCode(HttpStatus.UNAUTHORIZED);
//            return response.setComplete();
            //跳转登录页面
            return  this.toLoginPage(LOGIN_URL+"?FROM="+request.getURI().getPath(),exchange);
        }
        // 4 对当前的请求对象进行增强，让他携带令牌信息
        request.mutate().header("Authorization", "Bearer " + jwt);

        return chain.filter(exchange);
    }
//跳转登录界面
    private Mono<Void> toLoginPage(String loginUrl, ServerWebExchange exchange) {
        ServerHttpResponse response = exchange.getResponse();
        response.setStatusCode(HttpStatus.SEE_OTHER);
        response.getHeaders().set("Location",loginUrl);
        return response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
